Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

4 hosts · 328 ms

HostCertsFirst seenLast seenDNS
verimarkcert.com 11 2026-02-23 2026-09-14 ok
*.verimarkcert.com 9 2026-04-10 2026-09-14 —
link.verimarkcert.com 5 2026-05-20 2026-09-17 ok
www.verimarkcert.com 1 2026-02-23 2026-02-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/verimarkcert.com (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/verimarkcert.com.